Three-point disc amplitudes in the RNS formalism

We calculate all tree level string theory vacuum to Dp-brane disc amplitudes involving an arbitrary RR-state and two NS–NS vertex operators. This computation was earlier performed by K. Becker, Guo, and Robbins for the simplest case of a RR-state of type C(p−3)C(p−3). Here we use the aid of a computer to calculate all possible three-point amplitudes involving a RR-vertex operator of type C(p+1+2k)C(p+1+2k).